America proved its Bieber Fever was strong: The teen singer dominated the American Music Awards on Sunday night.
Bieber's wins included the show's top award, artist of the year.
The singer's mom joined him onstage as he collected the top award.
He looked to his mom: I wanted to thank you for always believing in me.
He said it's hard growing up with everyone watching me and asked that people continue to believe in him.
The 18-year-old also won favorite pop/rock album for Believe and male artist.
He performed two songs at the award show, one stripped and another upbeat with Nicki Minaj. As Bieber won his second award, he was kissed on the neck by Jenny McCarthy, who presented the award.
I want to say this is for all the haters who that I was just here for one or two years. I feel like I'm going to be here for a very long time, he said, also thanking his mom, manager, family and his beautiful, beautiful fans.
He gave a stripped down, acoustic performance of As Long As You Love Me, sitting down as someone played the guitar. He transitioned to the dance-heavy Beauty and a Beat, where Minaj joined him onstage, grinding with the teen for a few seconds.
Bieber's red and black outfit seemed to be the night's theme, as Swift and Usher wore similar ensembles.
Carly Rae Jepsen, who performed early in the night, won favorite new artist.
I am floored. Wow, she said, thanking Bieber and his manager, Scooter Braun.
Usher kicked off the three-hour show with green laser lights beaming onstage as he performed a medley of songs, including Numb, Climax and Can't Stop, Won't Stop, which featured a smoky floor and a number of backup dancers, as Usher jammed in all black, with the exception of his red shoes.
Swift won her fifth consecutive award for favorite country female artist.
This is unreal. I want to thank the fans. You guys are the ones who voted on this, she said. Luke Bryan won favorite country male artist and Lady Antebellum favorite country group.
Swift gave a masquerade-themed performance of the pop song I Knew You Were Trouble. She sang onstage in a light dress while dancers wore mostly black. But then she changed into a red corset and black skirt, matching their dark mood. She even danced and sang on the floor as lights flickered throughout the performance.
Minaj was also a consecutive winner, picking up her second trophy for favorite rap/hip-hop album for Pink Friday: Roman Reloaded. She was in an all-white get-up, including fur coat and pink hair. The scene was ghostly and snowy, as a choir — also in white — joined her onstage. One background singer stole the performance, belting semi-high notes as Minaj looked on.
Artist of the year: Justin Bieber
New artist of the year: Carly Rae Jepsen
Pop/rock female artist: Katy Perry
Pop/rock male artist: Justin Bieber
Pop/rock band, duo or group: Maroon 5
Pop/rock album: Justin Bieber, Believe
Country female artist: Taylor Swift
Country male artist: Luke Bryan
Country band, duo or group: Lady Antebellum
Country album: Carrie Underwood, Blown Away
Rap/hip-hop artist: Nicki Minaj
Rap/hip-hop album: Nicki Minaj, Pink Friday: Roman Reloaded
Soul/R&B female artist: Beyonce
Soul/R&B male artist: Usher
Soul/R&B album: Rihanna, Talk That Talk
Alternative rock artist: Linkin Park
Adult contemporary artist: Adele
Artist, Latin: Shakira
Artist, contemporary inspirational: tobyMac
Artist, electronic dance music: David Guetta